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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 17, 2018 | May 25, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 236.1 |  | $ 201.1
Deferred payments related to business combinations |  |  | $ 16.7 | $ 0.0 |
Vattikuti Technologies Pvt. Ltd. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash payments |  | $ 38.1 |  |  |
Net tangible assets acquired |  | 4.1 |  |  |
Intangible assets acquired |  | 24.2 |  |  |
Goodwill |  | $ 9.8 |  |  |
Weighted average useful life |  | 4 years 3 months 18 days |  |  |
InTouch |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash payments | $ 22.0 |  |  |  |
Net tangible assets acquired | 13.3 |  |  |  |
Goodwill | $ 25.4 |  |  |  |
Weighted average useful life | 5 years 8 months 12 days |  |  |  |
Total purchase consideration | $ 38.7 |  |  |  |
Deferred payments related to business combinations | $ 16.7 |  |  |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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